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You should note that the sagenb.org site is a hosted cloud service, where you have created an account. It happens to still be at Sage 5.4 for reasons that are not quite clear to me.

Your personal linux Sage version is only available to you, and lives on your computer. Naturally, the name and password might have no relation to each other.

You can do sage and then at the Sage prompt do

sage: notebook()

and see if that does anything different. It should open a browser by itself, no login required.